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• Wireless Internet Connection Sharing in Ubuntu

  - by klutch2

  As the title states, I need to share a wireless connection with a laptop running Ubuntu as the AP. The setup will be as follows: Corporate WiFi <<== Laptop <<== Other Devices i.e. (iPad, iPhone) I want to be able to connect the "Other Devices" via WiFi to the laptop. I have thought of setting up an ad-hoc network by connecting to the Corporate WiFi and then setting up a new network and hoping the connection to both would stay, but that doesn't seem to work. If I set up the ad-hoc network by itself, I can see it from my "Other Devices". The reason I need this is because for some reason, my iPad and my iPhone will not connect to my corporate WiFi and I need to use them so I want to use my laptop to share the connection and act as an AP for my "Other Devices". My laptop is a Chrome CR-48 running Ubuntu and as some of you might know, it does not have an ethernet port, so having a wired connecting and then setting up a network is out of question. I want to connect to the Corporate WiFi and share that connection by having the laptop act as an AP for other devices.

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• What would cause a single working website to not work on 1 out of 5 devices on a network?

  - by th3dude

  There is a specific website that loads up without problem on all machines on my network (both wired and wireless) except one laptop. This laptop is a Windows 7 machine that was just recovered using the recovery partition, so it is fresh. The site will not load in Firefox 3.6 or IE 8. The website is http://www.weightwacthers.com The site loads fine on my desktop, iPhone, and Droid, but not the laptop. In all my years in this business I've honestly never seen this happen. Also, 'Is it down for me or everyone' reports that it is indeed only me. What would cause this to happen?

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• Is there any reason to have 2 NICs on a server?

  - by RichAmberale

  Is there any reason to have 2 NICs on a server BESIDES the following cases? You need to connect to 2 different physical networks Redudancy (1 NIC fails, so you use the other) Are there any other reasons?

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• Routing connections through VPN based on hostname (not IP range)

  - by Michal M

  This bugs me immensly. I need to connect to client's network through VPN. But I definitely do not want to send all the traffic through client's network so this option is out of question. What I need basically is for the OS to know that all client's network subdomains (*.example.com) need to go through the VPN connection. I tried a couple of options: Changing order of services and setting the VPN on top, but this works the same as "Send all traffic over VPN connection". Using "VPN on Demand" option from network advanced options, but this feature is quite rubbish to be honest. Seems to work only in Safari (?!) and it doesn't route the connection, but it basically triggers the OS to connect to the selected VPN. The reason I need it to work based on hostnames rather than IP range is simple - my client has a lot of servers inside his network and it's impossible for me to remember all IPs. They are all within a range, but this doesn't help me remembering. Another option would be to put the VPN connection on the bottom of network services and untick "Send all traffic..." and then put all known hostnames in hosts file, but considering there could be hundreds of servers (therefore hostnames and ips too) it ridiculous job. And if new server appears on the network I'd need to edit the hosts file again. Sisyphean labours. However this works on Windows very simply. If a hostname is not available through default network interface, then it seems to try VPN connection and this works brilliantly. So, how can I achieve that on Mac, then? I know client's internal DNS addresses if that is of any help (like directing a certain domains through a different DNS)? PS. Using latest version 10.6.6. PS2. I am using VPN to access intranet, version control servers (svn://), samba shares and for SSH access to servers.

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• Access server by hostname without domain

  - by projectshave

  I want to access services on other machines on my home network with just their hostname. In every browser, "http://machine" fails, but adding a period in "http://machine./" works. Is there a way to avoid adding that extra period? My setup is a router with DD-WRT w/ DNSmasq turned on, Win7 machines and several Ubuntu VMs. nslookup works fine with just hostname. Remote desktop works, but TightVNC needs the extra period. ssh needs the period. As I said, all my browsers need the extra period. I'd prefer a solution that doesn't require manually maintaining the hosts file. Thanks.

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• No wireless adapter in msi u200

  - by Mino Marimat

  I have a MSi u200, and the weird thing was that I was using this normally before, then after a few minutes all of a sudden it couldn't find the wifi signal from my house. I did some troubleshooting and a bit of search in the control panel, and it seems like my hardware is missing. :( I can't even turn on the wireless light using Fn+F8, so my suspicions about the missing hardware strengthened. I tried searching for DIY fixes, but I found out that the wireless card is actually built-in deeper, unlike the RAM cards and the hard drive where you can either replace or add more cards. What do I do?? As of the moment, I can get connected to my wifi here at home using a wireless adapter via usb, and it's working. So my guess about the hardware problem seems correct. HELP!!! Thanks!

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• What is the network address (x.x.x.0) used for?

  - by Shtééf

  It appears to be common practice to not use the first address in a subnet, that is the IP 192.168.0.0/24, or a more exotic example would be 172.20.20.64/29. The ipcalc tool I frequently use follows the same practice: $ ipcalc -n -b 172.20.20.64/29 Address: 172.20.20.64 Netmask: 255.255.255.248 = 29 Wildcard: 0.0.0.7 => Network: 172.20.20.64/29 HostMin: 172.20.20.65 HostMax: 172.20.20.70 Broadcast: 172.20.20.71 Hosts/Net: 6 Class B, Private Internet But why is that HostMin is not simply 64 in this case? The 64 address is a valid address, right? And whatever the answer, does the same apply to IPv6? Perhaps slightly related: it also appears possible to use a TCP port 0 and an UDP port 0. Are these valid or used anywhere?

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• How to share internet over network

  - by abc

  i have a machine connected to internet, i want to set up proxy server or any other configuration that can help me to share internet over other machines in the same network machine may be of diff. platform (linux,mac, , windows), and server can be (either linux or windows) so how to configure now.. all machine are in network. Thanks

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• Is it possible to restrict the connection duration per client on the router (say with OpenWRT)?

  - by static

  How to limit the connection duration per client per period (say, one MAC-address can connect only for 3 hours per week to the network). Where could be defined such a rule? In the firewall? So the rule should define not statically times (this is simple), when the client is allowed to access the network, but the duration of the connection per day/week/month, etc. How/where to implement such rules? Is it possible to do so with OpenWRT/DD-WRT?

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• Cannot enable wireless Ubuntu 10.04

  - by woaddoa

  I have recently installed Ubuntu 10.04, however I am having trouble getting wireless to work. Ubuntu says that wireless is disabled, and I am unable to enable it. I have tried Administration Hardware Drivers however the only drivers listed are Nivida graphics ones. I am unsure what to do as I do not think the process is the same as searching for drivers for a windows machine. Any advice appreciated.

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• LMDE detects a wireless card, but can't use it

  - by Davidos

  LMDE can see my wireless card, and correctly identifies it, but it refuses to let me turn it on through the shiny graphical interface. Is there a way to use the non-shiny terminal to turn on my wireless? One small tidbit I noticed was the stated version; it says the version is 00. I believe that's hexadecimal for 0, which may indicate something screwy with the software. It would be nice if someone could tell me how to figure out how to solve this kind of problem in the future. *-network DISABLED description: Wireless interface product: Centrino Wireless-N 1000 vendor: Intel Corporation physical id: 0 bus info: pci@0000:09:00.0 logical name: wlan0 version: 00 serial: 91:e3:7b:0d:a3:a9 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-1-amd64 firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:43 memory:e1d00000-e1d01fff I've tested multiple other network managers, and none of them work. W ireless switch is on, I'm sure it's a driver problem.

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• iPhone 3G can't see any WiFi networks, ever

  - by torbengb

  I've got WiFi turned on in the settings, and ask before connect turned off. My iPhone 3G should see several WiFi networks, but it lists none. It also does not list my own network, which my computers see just fine. It has worked earlier but stopped working recently (possibly because of or at the same time of other trouble (which a restore solved)). The iPhone is not jailbroken. The SSID is not hidden, uses WPA2. It also finds no WiFi networks when I'm at a friend's house. His iPhone 2G sees several WiFi networks, including his own. When I use the manual entry method, specifying my home SSID and the proper WPA2 passkey, then click join, the iPhone says couldn't find that network. Same at my friend's place, with his SSID and passkey. I've just backed up my iPhone, then restored it, to see if refreshing the firmware would help. It didn't change anything. Is my iPhone broken? How can I fix this?

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• Why would one server be sending DUP ACK packets to one PC, which is responding with HTTP RST packets?

  - by IronicMuffin

  I'm not a network profressional, so please excuse any wrong language. I was debugging why my DNS traffic was a constant 160Kbps on our corporate network. I opened up a wireshark trace, and I see one PC of a coworker broadcasting HTTP [RST] packets to one of our DMZ servers at the rate of 1000 a second. He restarted his machine, and as soon as it went offline, the server started broadcasting [DUP] [ACK] packets, until he came back online. It then resumed the HTTP [RST] packets. Apparently this server has been doing this kind of behavior since it went live. I believe it did this with a printer and an access point as well. Can anyone explain why this behavior is occurring? Any solutions? The initial research was done because there have been "bandwidth issues" and I wonder if this is contributing.

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• How to control routes added by RasDial

  - by Robert Dodier

  I am using the RasDial function on a Windows box (Windows Server 2008) to dial a device from which the server then reads data. It seems that some new routes are added to the network routing table when the dial-up connection is made. That interferes with other network interfaces on the server. In particular, RasDial adds a default route which routes traffic to the device, which makes the server unreachable until the connection is dropped. Is there a way to control which routes are added by RasDial? I have been studying Microsoft's document for RasDial and associated items (RASDIALPARAMS, RASDIALEXTENSIONS) without finding anything about routing. There is an option for "Use default gateway on remote network" when configuring a VPN, but I don't see how to apply that in this case. Thanks for any light you can shed on this problem.

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• How can I configure a txqueuelen value to persist on reboot?

  - by kdt

  Hi, In CentOS 4.x, I can set the txqueuelen parameter on a network interface with "ifconfig eth0 txqueuelen 1000". However, this is lost when the machine reboots -- which configuration file should I use to set the persistent value of this parameter?

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• Monitoring/logging a malfunctioning internet connection

  - by Pekka

  I have a mysterious internet connection problem: Every 15-20 minutes, the connection will become very slow, and take 2-3 minutes for anything to load. I've had a technician from the ISP over here to test the hardware, and everything is in pristine condition. They have no other explanation than a configuration error on my machine, a possibility I can exclude 90% because I'm experiencing the same problems with another machine. I will have to monitor the situation now, and I would like to run a program that logs when internet connections become slow. I thought about putting something together using at and wget. Does anybody know of some other tool for this that does this out of the box - maybe something with an adjustable request frequency, logging connection speeds etc.?

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• Number of subnets for specific mask

  - by kutacz

  Question source Problem: Your company has been assigned the following IP address: 192.112.136.0 /27 Your group has been assigned the fourth subnet. Question 5: How many useable subnets are available for assignment? Why the answer is 6? I would shoot it's 8 , because 255/32 = 8. More generally - what is an correct algorithm to compute the number of available subnetworks for the same mask?

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• Network-related icons suddenly removed

  - by Velcro

  Hello, On a fresh Windows 7 installation, I created some shortcuts icons to network shares on the Desktop. Without any warning, these icons are sometimes and randomly deleted from Desktop. I totally don't understand what it happens! They are not hidden, they just are simply deleted. This behavior occurs on one computer in my company. Others Windows 7 computers are not affected by that. And also it's the first time I encounter that. Do you have an idea about this problem? Thanks.

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• How does a frame retrieve the recipient's MAC address?

  - by Sarmen B.

  I am studying a Network+ book named All-in-one CompTia Network+ by Mike Meyers. In chapter 2 he talks about frames and how he represents them as canisters and the data within the frame contains the recipients mac address, senders mac address, data, and sequence number. What I don't understand is if the sender is sending a file via the network to the recipient, and this frame contains this data, how does the frame know what the recipients MAC address is before sending it? In regards to TCP/IP when it contains the recipients IP address, that's understandable how it retrieves that value. But I don't understand how it can retrieve the MAC address, because if that frame comes from the senders computer, goes into the router and copies itself to each and every computer that exists on the network, how did it have the MAC address to know where to go? Let me know if I'm not making sense.

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• Multiple PCs - Single profile

  - by martixy

  Or how to create an AD(or similar) environment at home? So... I work in this big IT company(they have and AD environment ofc) and I've seen first hand how nice integration and log-in-from-anywhere(roaming?) profiles can be. So I wanna create the same setup at home, where I have 3 machines. Mostly logging in with the same profile and preserving the settings(things like UAC being off, a few group policies I've customized, things like that). How can I achieve something like this?

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• Spare PC with XP to be used as Torrent Downloader and local Web Server HOWTO?

  - by gslide

  Hi I'm a bit in a pickle in trying to setup my old laptop using Windows XP to be able to serve as two devices in one, I want to make it a downloader for torrents and a local web server as well and how to do this? I have a wireless NIC and LAN, and I have two internet connections and i would like to be able to download torrent only on LAN and be a webserver on the Wireless, also the webserver can be accessed through the internet. The reason for trying to separate the connection is I can't have torrent downloads using all my bandwidth as my web pages cant be access as it times out or too slow. I have two broadband connections, is this even possible or would i need a different OS or program that I can download? please

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• Website ocasionally does not load on first click

  - by tfe

  Today I noticed that my website hosted on a virtual server ocasionally does not load on first click. I click on some link, browser starts loading page but nothing loads and does not not appear any error message (like "connection reset by peer etc). Nothing. When I click the same link again, page loads immediately. The same situation on 2 computers in different browsers. It happends not always, maybe on each 20... or 30 click. Sites from other servers load without this problem. Any ideas what can cause this problem?

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• Clients can make maximum only 15 connections to ubuntu custom server

  - by gtan

  I have a custom server in C# being run on Ubuntu 9 under mono. I can make up to 15 silverlight clients connect to the server. When I make the 16th, it just waits. And if I close one of the established connections, the 16th client is able to connect. I am making the connections from one machine. I am also not exceeding any file handle limit. The limit is 1024 and I am having around 300. Any ideas how to make more connections? Also why the number 15? Is it something linux-specific? EDIT: I have run the same server on an Ubuntu 11.10 virtual machine and was able to make more than 15 connections. I presume it's a configuration problem on the Ubuntu 9 machine then. Any help on that?

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• How would I isolate one netowrked PC to LAN only?

  - by itsraine

  I would like to have one of my PCs available to the rest of my home network for file sharing and VNC access, but I want to block any Internet traffic going to and from the PC. In other words, I want all local PCs I have connected to the router functioning as any normal LAN would, but when it comes to the Internet I want one particular PC to be "safe" from the Internet. My guess is that this is some sort of port blocking or some other router function, but I'm not quite sure.

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• Windows 7 Built-In VPN - How to access network shares, printers, etc.?

  - by mbrion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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